Feeding device for percussive motors



9, 1932- w. A. SMITH, JR 1,870,389

FEEDING DEVICE FOR PERCUSSIVE MOTORS Filed May 31. 1930 Amara IN VEN TOR.

H15 A TTORNEY.

Patented Aug. 9, 1932 UNITED PATENT orFiea WILLIAM A. SMITH, JR., OF PHILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSOLL- RAND COMPANY, OF JERSEY CITY, NEVT JERSEY, A CORPORATION OF NEW JERSEY FEEDING DEVICE FOR PERCUSSIVE MOTORS Application filed. May 31,

This invention relates to feeding devices, but more particularly to a device of this character adapted for actuating a percussive motor relatively to its support and whereon the motor may be slidably mounted to assure the correct position thereof with respect to the work.

One object of the invention is to enable the percussive motor to be moved longitudi- 1 nally of a support or mounting by the force imparted thereto by the hammer piston upon reversal of said hammer piston at the end of its strokes.

Another object is to selectively use the jar resulting from the act of reversal of the hammer piston for actuating the motor either in the direction of the work or to retract the motor from the work.

Another object is to form an abutment for the motor in any and all of the positions which the mot-or may assume with respect to its support so that the motor will be prevented from recoiling from the direction in which it is desired to actuate it.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawing illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a plan view partly broken away of the feeding device and illustrating a practical application thereof,

Figure 2 is a side elevation partly in section of the feeding device together with the per- 5 cussive motor and a support therefor, and

Figure 3 is a transverse sectional view taken through Figure 2 on the line 33 looking in the direction indicated by the arrows.

Referring more particularly to the drawing, A designates a percussive motor, as for instance, a rock drill, and B a support therefor, such as a shell having internal longitudinally extending guideways C to receive guide ribs D carried by the motor A. The motor A, only a portion of which is shown, comprises a cylinder E having a piston chamber F wherein is disposed a reciprocatory hammer piston G to deliver blows of impact to an element intended to be actuated, as for example, a drill steel (not shown).

1930. Serial No. 457,824.

A back head H arranged at the rear end of the cylinder E may form a closure therefor and also serve as a housing for a throttle valve, only the lever J of which is shown. The throttle valve may, however, be of any known type commonly employed in devices of this character for controlling the admission of pressure fluid from a source of supply to the pressure fluid distributing element of the motor A.

F or the sake of simplicity of illustration, the pressure fluid distributing element, such as a valve, has been omitted, but it is to be understood that the same may be of any suitable type for effecting the distribution of pressure fluid to the ends of the piston chamber F to actuate the piston G.

In accordance with the practice of the invent-ion, the motor A is provided with means adapted to alternately seize and release a fixed element on the support to enable the motor to be actuated longitudinally of the support B. The means provided for this purpose includes a rod K which may, as shown, be of rectangular shape or any other convenient form to provide a bearing surface L on the top thereof, that is, on the side of the rod facing the motor A.

The rod K which extends throughout the entire length of the support B may be suitably secured at its front end to the corresponding end of the support and in this instance extends rearwardly of the support and is anchored to a cross head 0. The cross head O in turn is supported by a pair of rods or bolts P arranged on opposite sides of the rod K and which may be secured to the rear end of the support B in a well known manner.

In order to maintain the intermediate portion of the rod K adjacent the back head H rigid during the operation of the motor A, the said rod is supported by a bushing Q having a rectangular aperture R to receive the rod K. The bushing Q, is preferably disposed within a lug S which may form an integral portion of the cylinder E and has a head or shouder T at its front end which abuts the lug The rear end of the bushing Q is preferably threaded and extends rearwardly of the lug S to receive a nut U whereby said nushing may be securely clamped in position. The aperture R within the bushing Q is preferably of only sufficiently larger area than the rod K to assure against undue friction between these elements while at the same time forming a suitable bearing for the rod to maintain the intermediate portion of the rod in alignment with the ends of said rod.

Disposed upon the rod K and slidable with respect thereto is a casingV the rear and front ends of which serve as hearing portions for the intermediate portion of the rod K and have rectangular apertures W' and X respectively to receive the rod K. The casing V carries at its front end a flange Y having a bore Z to receive the bushing Q, and said flange is seated in this instance against the rear end of the lug S against which it is securely clamped by means of the nut U.

Within the casing V and between the apertures W and X is a recess b to receive a locking device designated generally by 0 and whichlocking device is adapted to frictionally engage both the rod K and the casing to hold the motor A immovable at the instant of reversal of the hammer piston G. The locking device shown for the purposes of illustration comprises a carriage d which is arranged laterally with respect to the rod K and carries at the end adjacent the rod K and on the front and rear sides of the carriage, lugs e to serve as bearings for pins f which form shafts for rollers g and h arranged at the rear and front ends respectively of the carriage d and which normally seat upon the bearing surface L of the rod K.

In the recess 6 rearwardly of the aperture X and overlying the surface L of the rod K is an inclined surface 7' suitably spaced from the surface L so that the roller h which is adapted to lie between the surfaces 7' and L may engage both surfaces for preventing recoil of the motor A in a rearwardly direction. Similarly, in the recess 6 and therefore forwardly of the aperture W is an inclined surface 70 which is inclined in the direction of the surface 7' and is adapted to engage one side of the roller 9 to prevent recoil of the motor A in a forwardly direction.

Convenient means are provided to enable either of the rollers g or k to be selectively moved into engagement with the rod K and the casing V, depending upon the direction in which it is desired to actuate the motor A. To this end the casing V is provided with a bore 0 which registers with a bore p in the carriage d. The bore 0 may, however, as illustrated, be of somewhat larger diameter than the bore p and forms a bearing for a rod (1 whereby the carriage (l may be actuated. The rod 9' is accordingly provided with an enlarged portion 1 which is journall-ed in the bore 0 and has a reduced portion 8 to form a shoulder t which acts as a seat for one end of a spring a disposed about the reduced portion 8 and seated with its other end against the carriage d.

The reduced portion 8 of the rod 9 extends through the bore 12 of the carriage d and has arranged on the end extending forwardly of the carriage d a spring *0 which seats with its rear end against the carriage d and with its other end against a cylindrical nut w threaded on the rod 9 and'being journalled in the front end of the bore 0.

The arrangement of the means for actuating the carriage (Z is such that when the rod q is reciprocated within the bore 0 one or the other of the springs u or 12 will be compressed to maintain one of the rollers, either km 9, in engagement with an inclined surface and the surface L of the rod K.

The rod 9 may be conveniently actuated r for this purpose by means of a crank handle a: secured to a shaft 1 which is journalled in the rear end of the casing V. The shaft y is provided with a pin .2 arranged eccentricah ly on the shaft y and extendin into an aperture 2 of a connecting link 3.

inserted in the rear end of the rod g.

In order'to enable the crank handle it and thus also the rod 9 to be conveniently maintained in any of a plurality of positions, as

for instance, for maintaining the carriage d in either extremity of the recessb, or in a neutral position, the said crank handle w'is proided with a spring pressed plunger 5 adaptcrank handle an in another limiting position, while the group 9 serves to hold said crank handle an in a neutral position and wherein the carriage (Z also occupies a neutral position.

The operation of the device is as follows:

Let it be assumed that it is intended to actuatethe motor A in the direction of the work. In such case the crank handle a: may be rocked to a position in which the spring pressed plunger 5 engages a serration 6 of the group designated 8. of the crank handle as the rod Q will be actuated to place the spring u under compression. The force thus stored in the spring 10 will actuate the carriage d in the direction of the inclined surface 7' and the roller h will then be wedged or forced between the said inclined surface 7', and the surface L of the rod K. With the hammer piston G in operation the motor A will beheld against rebound by the roller It at the time e connecting link is pivoted with its front end on a pin 4 In this position the hammer piston G reverses its direction of travel in the rear or right hand end of the cylinder E.

The motor A will, however, be free to be carried in a forwardly direction by the jar imparted thereto by the piston G upon reversal of the piston in the front end of the cylinder E and, due to this fact, each time the piston G reverses its direction of travel in the front end of the cylinder E the motor A Will be carried bodily in the direction of the work in accordance with the penetration of the working implement into the work. The carriage d being affixed to the motor will, of course, advance therewith and, inasmuch that the spring a is under compres sion the carriage cl, and thus also the roller it, will be correspondingly advanced along the rod K and the roller it will be held in constant readiness to engage the inclined surface and the bearing surface L to prevent recoil of the motor A.

After the working implement has penetrated the work to the desired depth and it is desired to retract the motor A, the crank handle w may be rotated to a position in which the spring pressed plunger 5 engages the serration 10. This movement of the crank handle :12 will carry the rod 9 rearwardly to release the spring u and place the spring 4; under compression. By placing the spring 1; under compression the carriage (Z will be actuated rearwardly so that the roller g will be in position to engage the inclined surface is and the bearing surface L.

In the new position of the carriage (Z and with the roller 9 in engagement with the aforesaid surfaces the motor A will be held against recoil in the direction of the work upon reversal of the piston G in the front end of the cylinder E. Upon the reversal of the hammer piston G at the end of its return stroke the ar imparted by the hammer piston G to the motor A will actuate the motor A rearwardly in the direction of the cross head 0 to return said motor to its starting position and also to remove the working implement from the work.

Whenever it is desired to manually actuate the motor A on its support or to let the motor A be moved by gravity, depending of course upon the osition of the drilling apparatus, the cranr handle 00 may be rocked to a position in which the spring pressed plunger 5 engages the serration 9. In this position of the crank handle the rod 9 will occupy a position in which both of the springs u and o are released. The carriage (i will then be held in a. neutral position and both of the rollers h and 9 will occupy positions in which they cannot eXert a gripping action on the surfaces adjacent thereto. The motor may then be moved along its support by manual pressure, or by gravity, if 111 an an inclined position.

I claim: I

1. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, means associated with the support having a bearing surface, a casing carried by the motor having a pair of inclined surfaces extending in opposite directions, spring oressed locking means in the casing, and manually operable means for pressing the locking means into engagement with the bearing surface and with either of the inclined surfaces to selectively prevent recoil of the motor upon reversal of the piston at either end of its stroke.

2. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a rod on the support having a bearing surface, a casing carried by the motor having a pair of inclined surfaces extending in opposite directions, a carriage in the casing, a plurality of locking members carried by the carriage, and manually operable means associated with the carriage for pressing either of the locking members into engagement with the bearing surface and an inclined surface to prevent recoil of the motor with respect to the support in one direction upon reversal of the piston.

3. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a rod on the support having a bearing surface, a casing carried by the motor having a pair of inclined surfaces extending in opposite directions, a carriage in the casing, a pair of rollers carried by the carriage, and manually operable spring pressed means in the casing and acting against the carriage for selectively pressing either of the rollers into engagement with the bearing surface and an inclined surface to prevent recoil of the motor with respect to the support upon reversal of the piston.

4. In a feeding device, the combination of a motor and a support Whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto tending to actuate the mot-or longitudinally of the support, means on the support forming a bearing surface, a casing carried by the motor having a pair of inclined surfaces extending in opposite directions, a locking device in the casing, and adjustable means in the casing for pressing the locking device into engagement with the bearing surface and selectively with either of the inclined surfaces to prevent recoil of the motor upon reversal of the piston.

5. In a feeding device, the combination of a motor and a support whereon said motor is islidably 'mounted, a reciprocatory hammer piston in the motor imparting jars thereto tending to actuate the motor longitudinally of the support, means on the support forming a bearing surface, a casing carried by the motor having a pair of inclined surfaces extending in opposite directions, a locking device in the casing adapted to frictionally engage the surfaces, and adjustable means in the casing for pressing the locking device into engagement with the bearing surface and selectively With either of the inclined surfaces to prevent recoil of themotor upon reversal of the piston.

In testimony whereof I have signed this WILLIAM A. SMITH, JR.

' specification. 

